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Product Description
- NLD/NTD shut-off valve is a pneumatically actuated sanitary single seat valve designed to detect product loss in case of the seal failure.
- Operating principle
- The valve is pneumatically actuated by means of compressed air.
- The valve is supplied with a NC single-acting pneumatic actuator, thus in case of air supply failure, the valve goes back to the safety position (closed valve).
- The detector is installed as NO (normally open), so that when the valve is closed, it lets the product out, thus giving a signal of leakage.
- The seat is provided with two gaskets, between which a safety or detection chamber with a direct outlet to the exterior via the detector is formed.
- Compressed air must simultaneously be supplied to the actuator (to open the valve) and to the detector to close it and prevent any loss of product.
- Small amounts of product may be lost at the moment of the valve actuation, an air flow regulator can be installed to synchronise the opening/closing times of the actuator/detector to minimise these losses.
Design and features:
- Robust and compact design.
- Normally closed valve standard version.
- Weld connections (mm or inches).
- Avalable sizes: DN 25/1" to DN 100/4".
- Easy disassembly of internal parts by loosening the clamp fastener.
- Open lantern to allow visual inspection of shaft sealing.
- 360º adjustable body.
Options:
- Gaskets: FPM.
- Connections: DIN, Clamp, SMS, RJT, FIL-IDF, etc.
- "Twin-Stop" actuator.
- INOXPA control unit for the main actuator.
- Position sensors in the main actuator.
- Steam barrier (if shaft sterilisation is required).
- Surface finish Ra ≤ 0,5 μm.
- Parts in contact with the product AISI 316L
- Other St.St. parts AISI 304
- Gasket EPDM according to FDA 177.2600
- Internal surface finish Ra ≤ 0,8 μm
- External surface finish bright polish
Product Specification
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